4Fill,C.(2002).Marketing Communications-Context,Strategies and Applications(3rd ed.).London:Prentice Hall.
5Gigby,D.,K.and Ledingham,D.(2004).CRM done right.Harvard business review.Pp:118-129.
6Lam,S.,Y.,Shankar,V.,Erramilli,M.,K.,and Murthy,B.,(2004),customer value,satisfaction,loyalty,and switching costs:an illustration from a business-to-business service context.Journal of academy of marketing science.Vol.32,No.3,pp:293-311.
7Uncle M D,Dowling G R and Hammond K.(2003).Customer loyalty and customer loyalty programs.Journal of consumer marketing.Vol.20,No.4,Pp:294-316.
8Zeithaml,V.A.and Bitner,M.J.(2003).Services Marketing—Integrating Customer Focus Across the Firm(3rd ed.)New York:Mc Graw-Hill/Irwin.